Okanogan River Tributaries Fish Passage

River Design Group is working with the Confederated Tribes of the Colville Reservation to evaluate fish passage options at several natural barriers that exclude steelhead from accessing potential spawning habitat. RDG completed surveys to characterize stream corridor conditions and to collect data necessary for design of fish passage alternatives for three barriers on Loup Loup Creek and two barriers on Antoine Creek. The surveys were used to develop hydraulic models to assess the passage potential for summer steelhead. RDG prepared design reports and cost estimates outlining alternatives that would improve fish passage at the barrier locations. Design alternatives considered include natural step-pool channels constructed from large wood and boulders, concrete weirs, and technical fishways.